| abstract |
The present invention provides a lithium ion battery, which includes a positive pole piece, a negative pole piece, a separator and an electrolyte. The positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm that is disposed on the surface of the positive electrode current collector and contains a positive electrode active material, wherein the positive electrode active material includes a matrix, a first coating layer coated on the surface of the matrix in discrete island-like shapes, and The second cladding layer covering the surface of the first cladding layer and the substrate in a continuous layered form. The electrolyte includes an additive A and an additive B, the additive A is selected from one or more of the cyclic sultone compounds shown in formula 1 and formula 2, and the additive B is selected from difluorobisoxalate lithium phosphate, tetrafluorooxalic acid One or both of Lithium Phosphate. The invention can reduce the gas production of the lithium ion battery, and significantly suppress the increase of the direct current internal resistance during the cycle and storage of the lithium ion battery. |